Herăstrău Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Herăstrău Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Herăstrău Lake today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 30 | 20.6°C | 20.0°C | |
| OCT 1 | 20.5°C | 15.0°C | |
| OCT 2 | 19.9°C | 15.0°C | |
| OCT 3 | 19.4°C | 15.0°C | |
| OCT 4 | 19.3°C | 15.0°C | |
| OCT 5 | 19.1°C | 15.0°C | |
| OCT 6 | 18.6°C | 15.0°C | |
| OCT 7 | 18.5°C | 15.0°C | |
| OCT 8 | 15.0°C | 18.3°C | |
| OCT 9 | 15.0°C | 18.2°C | |
| OCT 10 | 15.0°C | 18.0°C | |
| OCT 11 | 15.0°C | 17.8°C | |
| OCT 12 | 15.0°C | 17.6°C | |
| OCT 13 | 15.0°C | 17.5°C | |
| OCT 14 | 15.0°C | 17.3°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 7°C | 12°C |
| February | 2°C | 8°C | 12°C |
| March | 4°C | 10°C | 14°C |
| April | 10°C | 14°C | 18°C |
| May | 12°C | 18°C | 23°C |
| June | 14°C | 20°C | 27°C |
| July | 18°C | 23°C | 29°C |
| August | 18°C | 23°C | 29°C |
| September | 14°C | 20°C | 25°C |
| October | 11°C | 15°C | 19°C |
| November | 8°C | 12°C | 15°C |
| December | 3°C | 8°C | 12°C |
Herăstrău Lake: Water Temperature by Location
Herăstrău Lake: Weather Forecast
October 8
October 9
October 10
October 11
October 12
Location & Local Information
Lacul Herăstrău (Herăstrău Lake) is a shallow urban lake in the Bucharest–Ilfov area whose surface water temperature fluctuates through the year with the local seasons. In winter the lake often approaches near-freezing conditions, typically around 0–4 °C (32–39 °F). Spring brings a steady warming, with surface temperatures commonly between 6–15 °C (43–59 °F) as air temperatures rise. In summer the lake can warm significantly, with usual ranges of about 18–26 °C (64–79 °F) and occasional peaks up to 27–28 °C (80–82 °F) during heatwaves. Autumn sees a cooling trend back toward 10–18 °C (50–64 °F) before winter refreezes the surface in colder years. These values are approximate and vary with weather, depth, and wind.
Swimming in Lacul Herăstrău is generally not allowed and is discouraged by local authorities for several reasons. Water quality can be variable, with risks from urban runoff, algae or cyanobacterial blooms at times, and there is no regular lifeguard service or maintained bathing infrastructure. In addition, boat traffic and submerged hazards create safety concerns. Occasionally officially sanctioned events or controlled activities may permit entry under supervision, but for casual bathing the municipal regulations and safety considerations mean that swimming is typically prohibited.